News archive May 2013 - Koos van den Hout

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2013-05-31 (#) 8 years ago
@Wilboard Geen DAB software nog, helaas. Zou ik graag vinden, al is het maar om nu service scans te doen.
2013-05-31 (#) 8 years ago
@Wilboard met de noxon software + muxxi kan ik alle technische details zien van het aanbod
2013-05-31 (#) 8 years ago
@Wilboard een pure one mini die DAB+ en FM doet en een noxon usb stick die DAB+ doet en door rtl-sdr ondersteund wordt
2013-05-31 (#) 8 years ago
Eerste ontvangst van de VCR dab multiplex. Nog een beetje last van fading.
2013-05-31 (#) 8 years ago
Eerste signalen van het VCR DAB+ netwerk ontvangen. Momenteel 6 stations erbij: 100% NL, 538, BNR Nieuwsradio, Q-Music, Radio 10 Gold, SLAM!FM.

Het signaal lijkt nog in de eerste paar uur last te hebben van fading, op een plek in de woonkamer waar de publieke omroep mux ongestoord binnenkomt. Dit was vast het gevolg van het inregelen van het Single Frequency Network.

Details Met de noxon mediaplayer en muxxi is er natuurlijk een stuk meer detail uit te halen:

Ensemble name: DAB+ (eerder is VCR genoemd/getoond?) ID 8008 op kanaal 11C 220.352 MHz. Momenteel 312 (36.1%) Used CUs.
NameShort labelIDPTY (program type)LanguageECC (error correction)CountryComponents
5385388801Pop MusicnoneE38Netherlands0-Audio Stream DAB+: AAC+ codec 64 kpbs, 48 CUs, protection level EEP 3-A
VCRVCRE3811223nonenoneE38Netherlands0-Packet Data: 8 kbps, 6 CUs, protection level EEP 3-A
Radio 10 Gold10 Gold8802Rock MusicnoneE38Netherlands0-Audio Stream DAB+: AAC+ codec 64 kbps, 48 CUs, protection level EEP 3-A
Q-musicQ-music8803Pop MusicnoneE38Netherlands0-Audio Stream DAB+: AAC+ codec 80 kpbs, 60 CUs, protection level EEP 3-A
BNR NieuwsradioBNR8809NewsnoneE38Netherlands0-Audio Stream DAB+: AAC+ codec 64 kbps, 48 CUs, protection level EEP 3-A
SLAM!FMSLAM!FM8811Pop MusicnoneE38Netherlands0-Audio Stream DAB+: AAC+ codec 64 kbps, 48 CUs, protection level EEP 3-A
100% NL100% NL8815Pop MusicnoneE38Netherlands0-Audio Stream DAB+: AAC+ codec 72 kbps, 54 CUs, protection level EEP 3-A

De VCR slideshow blijft staan op 'Waiting for valid data' in de Noxon mediaplayer.

En Radio 10 Gold meldt nog vooral niet dat ze anders dan via de kabel, een AM frequentie en via internet streams te beluisteren zijn... De grote promotie is beloofd voor 1 september.

Een DAB+ multiplex bevat in totaal 864 capacity units (CUs). Daar zijn er dus 312 van in gebruik en 552 vrij. In 552 CUs passen nog 11.5 services van 58 CUs (64 kbps DAB+ met EEP 3-A foutcorrectie).

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2013-05-31 (#) 8 years ago
And looking for something else I came across rtl_fm guide: the long lost documentation where the ideas behind it and the command-line details are better explained. The main idea is to be able to decode FM, AM, USB and LSB with a light-weight system such as a RaspberryPi.

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2013-05-30 (#) 8 years ago
Trying to repeat the APRS decoding, this time with the scanner connected to the input of the audio card. No luck sofar, the scope in multimon shows something but it doesn't decode the signal.

I know I had to tweak seriously to get reception via the rtl_fm utility working so this is probably something with levels. And I'm using the earphone output of the hand scanner to feed the microphone/line (?) input of my laptop. Which has three mixers concerning the input level. And at the moment there is not a lot of APRS traffic to decode.

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2013-05-29 (#) 8 years ago
I checked for updates of NDPMon, an IPv6 neighbour discovery protocol monitor and noticed I was way behind the current times. I also found out it can now monitor multiple network interfaces in once instance of the program, so I can keep an eye on both wired and wireless networks at home.

Do take the advice of using the 'learning' mode of NDPMon as mentioned in the documentation for NDPMon. It makes getting the entire correct router advertisment correct into the datafile correctly so much easier. Downside is you have to run at a quiet time and after each IPv6 network reconfiguration.

It would also be nice if NDPMon would report on which interface certain traffic was seen.

Update: Ok, NDPMon still manages to warn about a router configuration it has learned itself. I found a remark in the NDPMon documentation/configuration page:
Under the tag addresses are listed the IPv6 global addresses of the router. This is not required for the tool to work properly, but can be useful is the router send NA messages for its global addresses (to avoid raising NA router flag alerts).
So I added the global IPv6 addresses of the routers, let's see if this decreases the noise.

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2013-05-27 (#) 8 years ago
Playing a bit with the RTL-SDR stick I hoped to decode APRS traffic. APRS is Automatic Packet Reporting System, a standard for radio amateurs to broadcast digital messages reporting location, status, weather and lots of other things. Nowadays a lot of traffic is location information, but there is a lot more. Information is transmitted at 1200 bps AFSK Frequency shift keying - Wikipedia so it can easily be handled by equipment for FM phone transmissions.

Looking around for options for decoding APRS traffic with gnuradio I ran into SDR with Raspberry Pi and DVB-T receivers - where it was described to skip a lot of steps and use the rtl_fm utility from the rtl-sdr source and multimon to do the decoding.

Reception of the signal via the NOXON DAB+ USB dongle is very noisy but playing with gain settings helped in eventually getting something decoded. Signal via the Wouxun transciever sounds a lot better. So maybe an audio cable from the Wouxun to a sound-card is in order to help with decoding this and other digital signals.
$ rtl_fm -f 144800000 -s 22050 -o 4 -g 100 -C - | tee >(nc -l 8080) | multimon -a AFSK1200 -t raw /dev/stdin 
multimod  (C) 1996/1997 by Tom Sailer HB9JNX/AE4WA
available demodulators: POCSAG512 POCSAG1200 POCSAG2400 EAS AFSK1200 AFSK2400 AFSK2400_2 HAPN4800 FSK9600 DTMF ZVEI SCOPE
Enabled demodulators: AFSK1200
Found 1 device(s):
  0:  NOXON, DAB Stick, SN: 0

Using device 0: Terratec NOXON DAB/DAB+ USB dongle (rev 1)
Found Fitipower FC0013 tuner
Oversampling input by: 12x.
Oversampling output by: 4x.
Buffer size: 7.74ms
Tuned to 145064600 Hz.
Sampling at 1058400 Hz.
Output at 22050 Hz.
Exact sample rate is: 1058400.010094 Hz
Tuner gain set to 100.00 dB.
AFSK1200: fm PE1REO-9 to APERXQ-0 via PI1APU-0 UI  pid=F0
!5203.76N/00504.56E>095/052Info QRZ.COM
And indeed: PE1REO shows up on

The tee command is to check audio with
$ nc thompson 8080 | play -t raw -r 22050 -e signed-integer -b 16 -c 1 -V1 -
The -g parameter in rtl_fm controls the gain, I had to search for a value which gave me a reasonable signal, at -g 100 about half of the databursts were decoded. It helps to hear the audio that rtl_fm is decoding to get an idea of reception.

It is truly amazing that this all can be done in software, with really minimal hardware.

My general idea is to be able to decode other digital amateur radio signals such as the telemetry from amateur radio balloon flights.

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2013-05-23 (#) 8 years ago
New release of Repocafe with new features. Most improvements are based on wishes from users. On our wishlist as developers is still MySQL support (and maybe other databases too) and git repo support.

Repocafe project at freecode

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2013-05-23 (#) 8 years ago
Ook IKEA België spamt zonder e-mail adressen te controleren:
Het is zover!

Je hebt je inschrijving geactiveerd. Voortaan ben je officieel lid van de grote IKEA FAMILY.
Ik heb niks en zeker niet toestemming gegeven om dat e-mail adres te gebruiken. En de optie 'dit is ongewenst/incorrect' zit niet in de e-mail.

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2013-05-23 (#) 8 years ago
Klein bedrag, privacy mag! #equens
2013-05-23 (#) 8 years ago
No two words strike fear into the hearts of adult people like "teambuilding exercise"
2013-05-22 (#) 8 years ago
@scottamcintyre be careful, that guy might launch a denial of hearing attack
2013-05-21 (#) 8 years ago
@chrisrowe sounds like a stock photo title
2013-05-19 (#) 8 years ago
We hebben een nieuwe televisie aangeschaft voor in de woonkamer. De wensen die ik had (voldoende ingangen) bleken in elke 'woonkamer' TV aanwezig te zijn dus dat was geen probleem, maar hielp ook niet bij selecteren. Uiteindelijk is het een Samsung geworden. Die ook 3D aankan en 'Smart Hub' heeft. Er zit gewoon een utp aansluiting aan de TV en dus had de TV ook al snel een IPv4 adres (nee, de TV doet geen IPv6 helaas).

In het 'Smart Hub' menu zitten dan ook 3D demo filmps, die vanaf een streaming service op Internet afgespeeld worden. En daar blijkt dat de ongeveer 8 megabit die we momenteel krijgen (het is wat afgezakt met het recente regenweer) een bottleneck is voor 3D HD content. Sommige films werden regelmatig onderbroken door een 'Loading...' indicator. Nu geeft de 3D demo applicatie bij het starten ook wel aan dat er 'breedband Internet' nodig is, alleen geen enkele indicatie wat precies 'breedband' is.

In het 'Smart Hub' menu zitten ook opties om films on-line te huren via onder andere movie max online. Ik weet niet of die apps zich iets meer aanpassen aan de beschikbare bandbreedte (vraag ook gesteld aan movie max klantenservice). De klantenservice gaf wel aan dat er breedband nodig is en een kabelverbinding met de TV de voorkeur heeft, maar niet de gewenste bandbreedte (misschien had ik de vraag ook niet helemaal duidelijk gesteld).

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2013-05-17 (#) 8 years ago
fail2ban   [Fail2Ban] SSH: banned
fail2ban   [Fail2Ban] SSH: banned
fail2ban   [Fail2Ban] SSH: banned
Distributed scanning? They were also quite close in time.

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2013-05-16 (#) 8 years ago
@remco72 gefeliciteerd, kies een mooie callsign uit!
2013-05-16 (#) 8 years ago
Danger: Beware of Ham Radio Operator Afgelopen weekend waren we op een camping in Velsen-zuid. Ik had de Wouxun porto mee en heb wat naar de repeaters geluisterd uit de buurt en CQ geroepen.

Ik vroeg me af op welke frequenties ik het 'mills on the air' evenement had kunnen tegenkomen, want dat lukte me tijdens het weekend niet echt. Toch maar eens de vraag hoe ik die frequenties had kunnen vinden op het forum gesteld en daar kwam een goeie uitleg met voorbeelden op terug. Voor 'echt' DX werk zal vaak een HF zendontvanger nodig zijn, dus.

Als ik toekom aan het bouwen van een flexibele 2m/70cm antenne is het ook wel een idee om te zorgen voor voldoende scheerlijn en coax om die antenne op een camping in een nabijgelegen boom te hangen zodat lokale en minder lokale contacten wat makkelijker zijn.

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2013-05-15 (#) 8 years ago
@Wilboard als het niet gelogd is, is het dan wel echt gebeurd? #descartesmaardananders
2013-05-14 (#) 8 years ago
Update to the NTP server project: I took pictures of the hardware and all the crystals I saw on the mainboard, visible at NTP server set on flickr. And the crystal involved in timing was easy to find: the standard timing crystal in PCs uses a 14.318 MHz crystal, the fourth crystal in the pictures.

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2013-05-14 (#) 8 years ago
@remco72 succes met het radio examen!
2013-05-13 (#) 8 years ago
I found the old rockwell jupiter gps board which I had not used in years and hooked it up to the NTP server project system. I was used to this GPS taking ages to get a location fix and being very finicky about reception. Not this time: between hooking it up to the system and walking back to my laptop and checking the gps output with minicom it already had enough of a location fix to start sending PPS pulses. And next..
# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
*xxxxxxxxxxxxxxx .PPS.            1 u    1   16    7   15.570   -6.927   9.294
 xxxxxxxxxxxxxxx .INIT.          16 u    -   64    0    0.000    0.000   0.000
 chime1.surfnet.  2 u   35   64    1   18.643   -7.491   0.000
 chime2.surfnet. .GPS.            1 u   34   64    1   19.214   -6.526   0.000
oPPS(0)          .PPS.            0 l    1   16    3    0.000   15.431   1.227

Update: But the situation isn't ideal, the PPS is voted falseticker after a while. Looking at the NMEA data, specifically the $GPRMC messages I notice there is no fix at all, but the PPS indicator (carrier detect) keeps ticking so minicom keeps switching between 'Online' and 'Offline'. At least this means all the bits are working.

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2013-05-13 (#) 8 years ago
De laatste tariefsverhoging van KPN voor het vaste net, met als excuus uitleg:
Steeds minder mensen maken gebruik van de vaste telefoon waardoor de kosten per gebruiker stijgen. Daarom zijn wij genoodzaakt om enkele tarieven te verhogen.
maakte het tijd om een portering aan te vragen naar een VoIP aanbieder. Per maand betaal ik voor ISDN1 met belvrij weekend straks EUR 23.43 (was EUR 21.24).

ISDN is een hele mooie technologie, en ik vind het jammer om er minder mee te doen, maar de tarieven zijn dusdanig dat het de moeite is om met VoIP te gaan bellen. SIP geeft me zeker bij een provider die het goed implementeert en weet dat er mensen asterisk gebruiken vergelijkbare signalering en informatie. Een Internet aansluiting willen we toch altijd wel hebben dus de telefonie kan daar ook overheen.

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2013-05-13 (#) 8 years ago
Interesting article: A Saudi Arabia Telecom's Surveillance Pitch - Moxie Marlinspike. Starting at a simple but chilling request by a big telco providing mobile Internet access in Saudi Arabia looking for lots of interception options it shows how 'security' and 'privacy' are becoming the victims of a trade in security exploits by parties who rather want to have an edge in accessing the private data of others than have security in general improve. The very interesting part is the observation by Moxie Marlinspike how he feels about this development:
If I'm really honest with myself, though, my interest in the preservation of 0day was also because there was something fun about an insecure internet at the time, particularly since that insecurity predominately tended to be leveraged by a class of people that I generally liked against a class of people that I generally disliked.
It's hard to say exactly when it happened, but these days, the insecurity of the internet is now more predominantly leveraged by people that I dislike against people that I like. More often than not, that’s by governments against people.
Please make computer systems more secure for everyone. Yes, that will include evil corporations. But the end users who may be able to communicate securely and in private in the end will thank you.

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2013-05-13 (#) 8 years ago
IPv6 is op steeds meer plekken, en toen Henk van de Kamer mij vroeg om een wijziging te maken om IPv4 zonetransfers weer mogelijk te maken, gaf ik als antwoord dat ik naast IPv4 ook IPv6 transfers wilde toestaan voor Zo geconfigureerd, en nu werkt het, en het resultaat is er ook naar: op de readyness tester: 5 sterren. Mail en web diensten voor dit domein zijn volledig bereikbaar via zowel IPv6 als IPv4.

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2013-05-12 (#) 8 years ago
Update for the NTP server project: the SATA cables arrived and I managed to fit everything in the case. I think I removed and replaced the central fan in the case about 15 times, it is always in the way whenever anything happens in the front area of the 1U case. Ubuntu 12.04 LTS is now happily installing on a linux software raid.

Interestingly, when I copy the Ubuntu 12.04 LTS .iso to an USB stick as-is it boots and works fine, when I use usb-creator-gtk on an Ubuntu 10.04.4 LTS system with the Ubuntu 12.04 LTS .iso (amd64) it creates an USB stick which hangs during boot. I guess Ubuntu is also using isohybrid for .iso images now but usb-creator-gtk doesn't recognize those somehow.

Update: The ntp package from Ubuntu 12.04 includes no ATOM refclock support (refclock 22). So I removed the package again and built ntpd from sources, using the hints from LinuxPPS NTPD support on how to make sure the right timepps.h is available. The first tests look good:
# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
*xxxxxxxxxxxxxxx .PPS.            1 u   11   16  377   15.920   -2.472  35.941
 xxxxxxxxxxxxxxx .INIT.          16 u    -   64    0    0.000    0.000   0.000
+chime1.surfnet.     2 u   39   64  177   14.826   -1.898  28.043
+chime2.surfnet. .GPS.            1 u   30   64  177   18.103   -3.296   1.623
 PPS(0)          .PPS.            0 l    -   16    0    0.000    0.000   0.000
I have a rockwell jupiter gps board with PPS support available to test with.

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2013-05-08 (#) 8 years ago
RT @bicyclemark: It feels like there’s more outrage when Syria loses Internet than when it’s people are bombed and cities reduced to rubble.
2013-05-08 (#) 8 years ago
multicast stream test image: Philips PM5544 testcard I had to test some part of the multicast setup on the work network and fired up VLC.

And from the department of 'some things never change' or 'still going strong', Bratislava STV2 testcard is still available under the title 'Monoskop' on vlc url rtp://@ This stream must have been going for years, I remember using it in tests years ago.

And during the day when STV2 has no program, it still transmits an actual Philips PM5544 testcard.

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2013-05-06 (More amateur radio (related) balloon flights. This one is a combined tracked stratosphere balloon / ...) 8 years ago
Google+Koos van den Hout : More amateur radio (related) balloon flights. This one is a combined tracked stratosphere balloon / filming plan. The page is a bit of a 'making of'. Found via : 434 MHz balloon flight with a difference - Southgate Amateur Radio News.
2013-05-05 (#) 8 years ago
Vanavond geprobeerd CQ te roepen op 145.500 MHz (mobiele oproepfrequentie 2 meter amateur band). Geen reactie. Toch ga ik het vaker proberen en in de scanners deze frequentie inprogrammeren.

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2013-05-04 (#) 8 years ago
Some more tries to get the server running which I've been working on a few times. To keep all my notes together I started a webpage about it: NTP server.

From PLD linux I was able to reset the IPMI config so I could manage the system remotely (away from the fan noise!). In the Ubuntu and Debian installers the remote keyboard access was unavailable so I still had to walk up to the system from time to time to answer installer questions, but I could view the progress bars from a different room.

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2013-05-04 (Keep your antivirus software up to date...) 8 years ago
Google+Koos van den Hout : Keep your antivirus software up to date...
2013-05-03 (#) 8 years ago
Upside of using asterisk for the home telephony: it's quite easy to browse the call detail records and do some calculations on them. So when our fixed line provider came with yet another price increase it was time to shop around for better options. And comparing rates is a lot easier when you have an exact log of how many calls for how long to which destinations were made in the previous months.

I'll miss the high level of control and call-progress indication ISDN offers, but prices for SIP accounts are a lot better and call-progress for SIP is comparable to ISDN.

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2013-05-03 (#) 8 years ago
Looking for specs on what to use (paper weight and size) when creating my own QSL cards, I ran into PDF qsl card creator which asks all the right questions and results in a simple and correct QSL card as a pdf file which you can then improve. Or just upload it to a QSL printing service which accepts PDF submissions.

Currently I hope to exchange 1 (one) QSL card soonish so I'll use this to help me print it. I bought 160g/sq. meter paper which should be great for QSL cards. The correct size is 140mm by 90mm. Cards to this standard should be accepted and forwarded by QSL bureaus.

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IPv6 check

Running test...
, reachable as PGP encrypted e-mail preferred. PGP key 5BA9 368B E6F3 34E4 local copy PGP key 5BA9 368B E6F3 34E4 via keyservers

Meningen zijn die van mezelf, wat ik schrijf is beschermd door auteursrecht. Sommige publicaties bevatten een expliciete vermelding dat ze ongevraagd gedeeld mogen worden.
My opinions are my own, what I write is protected by copyrights. Some publications contain an explicit license statement which allows sharing without asking permission.
Other webprojects: Camp Wireless, wireless Internet access at campsites, The Virtual Bookcase, book reviews
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